牛圈湖油田西山窑组属于低孔、低渗、低压的“三低”油藏。由于注入水为淡水，且原始含油饱和度较低，使水淹层的电阻率较高。利用常规测井解释方法，易把水淹层解释为油层，导致射孔投产后的生产井高含水。文中利用常规测井资料，结合试油试采、岩心分析等资料，研究了水淹层地球物理变化特征与定量解释模型，建立了适合牛圈湖油田的水淹层解释方法，现场应用也取得了较好效果。

The reservoir ofXishanyao Formation in Niuquanhu Oilfield is characterized by lowporosity, lowpermeability and lowpressure. Because the injection water is fresh water and the original oil saturation is low, the resistivity of water flooded layer is high. The water flooded layers are often wrongly interpreted as oil layers by using conventional log interpretation, which results in high water cut after the perforating operation. The conventional logging data combining with oil testing data and core analysis are applied to study the geophysical characteristics and quantitative interpretation model of water flooded layers, and establish the interpretation method for water flooded layer in Niuquanhu Oilfield. The field application proves the good effect.